Refrigerator



FIG. 1 is a perspective view of a refrigerator having one column according to the present invention;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a side elevation view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom elevation view thereof.

The broken line showing of environment is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a refrigerator, as shown and described. 